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Debt - Debt Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 8,043.1 $ 9,209.4
Less: Debt discount (146.9) (273.0)
Less: Debt issuance costs (27.7) (32.3)
Net long-term debt including current maturities 7,868.5 8,904.1
Less: Current maturities 0.0 (1,322.9)
Net long-term debt 7,868.5 7,581.2
Line of Credit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities 1,540.1 2,346.6
Less: Debt issuance costs (11.2) (10.0)
Senior Indebtedness    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 7,140.1 7,946.6
Senior Indebtedness | 3.922% 2021 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 3.922%  
Effective Interest Rate 4.50%  
Gross long-term debt including current maturities $ 0.0 1,000.0
Less: Debt discount 0.0 (0.3)
Less: Debt issuance costs $ 0.0 (0.7)
Senior Indebtedness | 4.333% 2023 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 4.333%  
Effective Interest Rate 4.70%  
Gross long-term debt including current maturities $ 1,000.0 1,000.0
Less: Debt discount (1.6) (2.4)
Less: Debt issuance costs $ (3.5) (5.3)
Senior Indebtedness | 2.670% 2023 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 2.67%  
Effective Interest Rate 2.80%  
Gross long-term debt including current maturities $ 1,000.0 1,000.0
Less: Debt discount (1.6) (2.3)
Less: Debt issuance costs $ (0.9) (1.3)
Senior Indebtedness | 0.972% 2024 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 0.972%  
Effective Interest Rate 1.10%  
Gross long-term debt including current maturities $ 1,400.0 1,400.0
Less: Debt discount (2.8) (3.8)
Less: Debt issuance costs $ (1.5) (2.0)
Senior Indebtedness | 0.983% 2024 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 0.983%  
Effective Interest Rate 1.10%  
Gross long-term debt including current maturities $ 1,000.0 0.0
Less: Debt discount (2.5) 0.0
Less: Debt issuance costs $ (1.5) 0.0
Senior Indebtedness | 4.250% 2025 Notes    
Debt Instrument [Line Items]    
Coupon Interest Rate 4.25%  
Effective Interest Rate 4.60%  
Gross long-term debt including current maturities $ 1,200.0 1,200.0
Less: Debt discount (10.8) (12.8)
Less: Debt issuance costs (1.4) (1.7)
Convertible Debt    
Debt Instrument [Line Items]    
Gross long-term debt including current maturities $ 903.0 1,262.8
Senior Subordinated Convertible Debt | 2015 Senior Convertible Debt    
Debt Instrument [Line Items]    
Coupon Interest Rate 1.625%  
Effective Interest Rate 5.90%  
Fair Value of Liability Component at Issuance $ 30.4  
Gross long-term debt including current maturities 34.4 141.4
Less: Debt discount (4.0) (20.1)
Less: Debt issuance costs $ (0.1) (0.7)
Senior Subordinated Convertible Debt | 2017 Senior Convertible Debt    
Debt Instrument [Line Items]    
Coupon Interest Rate 1.625%  
Effective Interest Rate 6.00%  
Fair Value of Liability Component at Issuance $ 155.9  
Gross long-term debt including current maturities 193.0 333.3
Less: Debt discount (36.9) (71.3)
Less: Debt issuance costs $ (0.9) (1.8)
Senior Subordinated Convertible Debt | 2020 Senior Convertible Debt    
Debt Instrument [Line Items]    
Coupon Interest Rate 0.125%  
Effective Interest Rate 5.10%  
Fair Value of Liability Component at Issuance $ 555.5  
Gross long-term debt including current maturities 665.5 665.5
Less: Debt discount (82.0) (101.6)
Less: Debt issuance costs $ (6.7) (8.3)
Junior Subordinated Convertible Debt | 2017 Junior Convertible Debt    
Debt Instrument [Line Items]    
Coupon Interest Rate 2.25%  
Effective Interest Rate 7.40%  
Fair Value of Liability Component at Issuance $ 5.4  
Gross long-term debt including current maturities 10.1 122.6
Less: Debt discount (4.7) (58.4)
Less: Debt issuance costs $ 0.0 $ (0.5)